I like the font-squirrel suggestion - very neat! This will also work using Cufon, which some people may be more familiar with.

If you are using a jQuery or other toolkit on the page you can search and replace the exclamation marks with something else, e.g. wrap a class around them. Then you can do a Cufon.now on that class.

From there on you can put in some animations, title tags, whacky any-thing - however - bear in mind that exclamation marks are generally best used sparingly! Except in the offices of the Exclamation Mark Liberation Front! (I made that last bit up! But you get the idea !?!?!!?)